EP3673980A1 - Élément de membrane et cartouche filtrante - Google Patents

Élément de membrane et cartouche filtrante Download PDF

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Publication number
EP3673980A1
EP3673980A1 EP18848985.0A EP18848985A EP3673980A1 EP 3673980 A1 EP3673980 A1 EP 3673980A1 EP 18848985 A EP18848985 A EP 18848985A EP 3673980 A1 EP3673980 A1 EP 3673980A1
Authority
EP
European Patent Office
Prior art keywords
membrane unit
membrane
raw water
unit
flow passage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP18848985.0A
Other languages
German (de)
English (en)
Other versions
EP3673980A4 (fr
Inventor
Ke SHEN
Yizhi Hou
Chen Wang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AO Smith Corp
Original Assignee
AO Smith Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201721047437.6U external-priority patent/CN207418343U/zh
Priority claimed from CN201710719677.4A external-priority patent/CN109422329B/zh
Priority claimed from CN201721647839.XU external-priority patent/CN207667450U/zh
Application filed by AO Smith Corp filed Critical AO Smith Corp
Publication of EP3673980A1 publication Critical patent/EP3673980A1/fr
Publication of EP3673980A4 publication Critical patent/EP3673980A4/fr
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/10—Spiral-wound membrane modules
    • B01D63/107—Specific properties of the central tube or the permeate channel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/025—Reverse osmosis; Hyperfiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/027—Nanofiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/029—Multistep processes comprising different kinds of membrane processes selected from reverse osmosis, hyperfiltration or nanofiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/10—Spiral-wound membrane modules
    • B01D63/12—Spiral-wound membrane modules comprising multiple spiral-wound assemblies
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/04—Specific sealing means
    • B01D2313/042—Adhesives or glues
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/08—Flow guidance means within the module or the apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/08—Flow guidance means within the module or the apparatus
    • B01D2313/086—Meandering flow path over the membrane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/19—Specific flow restrictors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/21—Specific headers, end caps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2315/00—Details relating to the membrane module operation
    • B01D2315/10—Cross-flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2319/00—Membrane assemblies within one housing
    • B01D2319/02—Elements in series
    • B01D2319/022—Reject series
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2319/00—Membrane assemblies within one housing
    • B01D2319/06—Use of membranes of different materials or properties within one module
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/004—Seals, connections
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/006—Cartridges
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions

Definitions

  • the present application relates to the field of water treatment, in particular to a membrane element and a filter cartridge.
  • a wound membrane element is often used for filtering water.
  • a raw water flow passage is formed on a front interlayer of a membrane element, and a pure water flow passage is formed on a rear interlayer of the membrane element.
  • a raw water flow passage has a length corresponding to that of a pure water flow passage; when a raw water flow passage of a single membrane element is too long, the corresponding pure water flow passage is also too long; consequently, the back pressure on the pure water side of the membrane element is high, leading to a decrease in the pure water yield of the membrane under the same water inlet pressure.
  • a technical problem to be solved by the present application is providing a membrane element and a filter cartridge that may solve at least one of the above-mentioned technical problems.
  • a membrane element comprising:
  • said first membrane unit and said second membrane unit are wound on said water collecting tube together in one step.
  • said first membrane unit and said second membrane unit are stacked when said membrane element is expanded.
  • said membrane element when expanded, is provided with a first side that is connected to said water collecting tube and a second side that faces said first side; the waste water outlet of said first membrane unit and the raw water inlet of said second membrane unit, when said membrane element is expanded, are located on said second side.
  • said membrane element when expanded, is provided with a third side and a fourth side that face each other, said third side and said fourth side are connected to said first side and said second side, respectively, the raw water inlet of said first membrane unit is disposed on said third side that is close to said first side, and the waste water outlet of said second membrane unit is disposed on said fourth side that is close to said first side.
  • the part of the third side on the side of the raw water flow passage of said first membrane unit except the raw water inlet of said first membrane unit is sealed, and the fourth side on the side of the raw water flow passage of said first membrane unit is sealed; the part of the fourth side on the side of the raw water flow passage of said second membrane unit except the waste water outlet of said second membrane unit is sealed, and the third side on the side of the raw water flow passage of said second membrane unit is sealed.
  • the third side on the side of the raw water flow passage of said first membrane unit, except the part corresponding to the raw water inlet of said first membrane unit, and the third side on the side of the raw water flow passage of said second membrane unit, except the part corresponding to the raw water inlet of said first membrane unit, are sealed by a first end cover, and a part of the third side of said second membrane unit corresponding to the raw water inlet of said first membrane unit is sealed on the surface of said second membrane unit that is close to the third side and on the side of the raw water flow passage.
  • the fourth side on the side of the raw water flow passage of said second membrane unit, except the part corresponding to the waste water outlet of said second membrane unit, and the fourth side on the side of the raw water flow passage of said first membrane unit, except the part corresponding to the waste water outlet of said second membrane unit, are sealed by a second end cover, and a part of the fourth side of said first membrane unit corresponding to the waste water outlet of said second membrane unit is sealed on the surface of said first membrane unit that is close to the fourth side and on the side of the raw water flow passage.
  • the waste water outlet of said first membrane unit and the raw water inlet of said second membrane unit are located at one end of said membrane element, and the raw water inlet of said first membrane unit and the waste water outlet of said second membrane unit are located at the other end of said membrane element.
  • said membrane element when expanded, is provided with a first side that is connected to said water collecting tube and a second side that faces said first side
  • said membrane element when expanded, is further provided with a third side and a fourth side that face each other, said third side and said fourth side are connected to said first side and said second side, respectively
  • the waste water outlet of said first membrane unit is disposed on said fourth side that is close to said second side
  • the raw water inlet of said second membrane unit is disposed on said fourth side that is close to said first side
  • the raw water inlet of said first membrane unit is disposed on said third side that is close to said first side
  • the waste water outlet of said second membrane unit is disposed on said third side that is close to said second side.
  • the part of the third side on the side of the raw water flow passage of said first membrane unit except the raw water inlet of said first membrane unit is sealed, and the part of the fourth side on the side of the raw water flow passage of said first membrane unit except the waste water outlet of said first membrane unit is sealed; the part of the fourth side on the side of the raw water flow passage of said second membrane unit except the raw water inlet of said second membrane unit is sealed, the part of the third side on the side of the raw water flow passage of said second membrane unit except the waste water outlet of said second membrane unit is sealed, and the second side of said membrane element is sealed.
  • the third side on the side of the raw water flow passage of said first membrane unit except the part corresponding to the raw water inlet of said first membrane unit and the waste water outlet of said second membrane unit, and the third side on the side of the raw water flow passage of said second membrane unit except the part corresponding to the raw water inlet of said first membrane unit and the waste water outlet of said second membrane unit are sealed by an end cover; a part of the third side of said first membrane unit corresponding to the waste water outlet of said second membrane unit is sealed on the surface of said first membrane unit that is close to the third side and on the side of the raw water flow passage; a part of the third side of said second membrane unit corresponding to the raw water inlet of said first membrane unit is sealed on the surface of said second membrane unit that is close to the third side and on the side of the raw water flow passage.
  • the fourth side on the side of the raw water flow passage of said first membrane unit except the part corresponding to the waste water outlet of said first membrane unit and the raw water inlet of said second membrane unit, and the fourth side on the side of the raw water flow passage of said second membrane unit except the part corresponding to the waste water outlet of said first membrane unit and the raw water inlet of said second membrane unit are sealed by an end cover; a part of the fourth side of said first membrane unit corresponding to the raw water inlet of said second membrane unit is sealed on the surface of said first membrane unit that is close to the fourth side and on the side of the raw water flow passage; a part of the fourth side of said second membrane unit corresponding to the waste water outlet of said first membrane unit is sealed on the surface of said second membrane unit that is close to the fourth side and on the side of the raw water flow passage.
  • said membrane element further comprises a first end cover and a second end cover that are disposed on either end of said water collecting tube, said first end cover being provided with a first opening that is in communication with the raw water inlet of said first membrane unit and a second opening that is in communication with the waste water outlet of said second membrane unit, said second end cover being provided with a third through hole that is in communication with the waste water outlet of said first membrane unit and a fourth through hole that is in communication with the raw water inlet of said second membrane unit.
  • said first membrane unit and said second membrane unit are configured in parallel in an axial direction of said water collecting tube, and said membrane element, when expanded, is provided with a first side that is connected to said water collecting tube and a second side that faces said first side; the waste water outlet of said first membrane unit and the raw water inlet of said second membrane unit, when said membrane element is expanded, are located on said second side, said membrane element, when expanded, is provided with a third side and a fourth side that face each other, said third side and said fourth side are connected to said first side and said second side, respectively, the raw water inlet of said first membrane unit is disposed on said third side that is close to said first side, and the waste water outlet of said second membrane unit is disposed on said fourth side that is close to said first side.
  • said first membrane unit is provided with a first end and a second end that face each other in an axial direction of said water collecting tube
  • said second membrane unit is provided with a third end and a fourth end that face each other in an axial direction of said water collecting tube
  • said membrane element comprises a first end cover, a second end cover, a third end cover, and fourth end cover, said first end cover, second end cover, third end cover and fourth end cover being correspondingly disposed at the first end and second end of said first membrane unit and disposed at the third end and fourth end of said second membrane unit; the part of the third side on the side of the raw water flow passage of said first membrane unit except the raw water inlet of said first membrane unit is sealed by the first end cover; the fourth side on the side of the raw water flow passage of said first membrane unit is sealed by the second end cover; the third side on the side of the raw water flow passage of said second membrane unit is sealed by the
  • said membrane element when expanded, is provided with a first side that is connected to said water collecting tube and a second side that faces said first side; the waste water outlet of said first membrane unit and the raw water inlet of said second membrane unit, when said membrane element is expanded, are located on said second side, said membrane element comprises a membrane shell, and a third space is formed between said membrane shell and an outer wall of said first membrane unit and/or said second membrane unit.
  • said first membrane unit and said second membrane unit are made of the same or different filter membrane materials.
  • said first membrane unit is a nanofiltration membrane
  • said second membrane unit is a reverse osmosis membrane
  • said first membrane unit has a surface area smaller than that of said second membrane unit.
  • said first membrane unit and said second membrane unit are reverse osmosis membranes.
  • said first membrane unit has a surface area larger than that of said second membrane unit.
  • a plurality of first membrane units are provided, and said plurality of first membrane units are made of the same or different filter membrane materials.
  • a plurality of second membrane units are provided, and said plurality of second membrane units are made of the same or different filter membrane materials.
  • the raw water flow passage of said first membrane unit and that of said second membrane unit extend spirally in a circumferential direction of said water collecting tube.
  • the present application further discloses a membrane element, comprising: at least one water collecting tube, a first membrane unit wound on said water collecting tube, and a second membrane unit wound on said water collecting tube, wherein at least one of the raw water flow passage of said first membrane unit and that of said second membrane unit extends spirally in a circumferential direction of said water collecting tube, and the waste water outlet of said first membrane unit is in communication with the raw water inlet of said second membrane unit.
  • Embodiments of the present application further disclose a filter cartridge that comprises the above-described membrane element.
  • the pure water flow passage of a membrane element in embodiments of the present application remains unchanged, and therefore the back pressure of pure water remains unchanged; however, by methods such as connecting surfaces in series, the number of raw water inlet leaves is decreased and the raw water flow passage is lengthened; thus, the surface flow rate of the membrane element can be improved, the anti-contamination performance of the membrane can be enhanced, the service life of the membrane can be prolonged, and the pure water yield of the membrane element under the same water inlet pressure remains unchanged.
  • the method for preparing the membrane element in the embodiments of the present application is simple.
  • the membrane element in the embodiments of the present application has a small size.
  • An embodiment of the present application discloses a membrane element, comprising: at least one water collecting tube 1, and a first membrane unit 2 and a second membrane unit 3 that are wound on said water collecting tube 1 together.
  • An embodiment of the present application discloses a membrane element, comprising: at least one water collecting tube 1, a first membrane unit 2 wound on said water collecting tube 1, and a second membrane unit 3 wound on said water collecting tube 1.
  • the raw water flow passage of said first membrane unit 2 and that of said second membrane unit 3 extend spirally in a circumferential direction of said water collecting tube 1.
  • At least one of the raw water flow passage of said first membrane unit 2 and that of said second membrane unit 3 extends spirally in a circumferential direction of said water collecting tube 1.
  • a waste water outlet 22 of said first membrane unit is in communication with a raw water inlet 31 of said second membrane unit; when said first membrane unit 2 and said second membrane unit 3 are expanded, the waste water outlet 22 of said first membrane unit and the raw water inlet 31 of said second membrane unit are located on the same side.
  • said first membrane unit 2 and said second membrane unit 3 When said first membrane unit 2 and said second membrane unit 3 are expanded, said first membrane unit 2 and said second membrane unit 3 may be stacked.
  • Said first membrane unit 2 and said second membrane unit 3 may also be configured in parallel in an axial direction of said water collecting tube 1.
  • the waste water outlet 22 of said first membrane unit may be located on a circumferential surface of said membrane element, and the raw water inlet 31 of said second membrane unit may be located on a circumferential surface of said membrane element.
  • the waste water outlet 22 of said first membrane unit and the raw water inlet 31 of said second membrane unit may be located in an end portion of at least one end of said membrane element.
  • Said first membrane unit 2 and said second membrane unit 3 may be wound on said water collecting tube 1 together.
  • Said first membrane unit 2 and said second membrane unit 3 may be wound on said water collecting tube 1 together in one step.
  • the waste water outlet 22 of the first membrane unit is in communication with the raw water inlet 31 of the second membrane unit.
  • the pure water flow passage remains unchanged as the raw water flow passage is lengthened, and therefore the back pressure of pure water remains unchanged; however, by methods such as connecting surfaces in series, the number of raw water inlet leaves is decreased and the raw water flow passage is lengthened; thus, the surface flow rate of the membrane element can be improved, the anti-contamination performance of the membrane can be enhanced, the service life of the membrane can be prolonged, and the pure water yield of the membrane element under the same water inlet pressure remains unchanged.
  • the waste water outlet of said first membrane unit and the raw water inlet of said second membrane unit are located on the same side, which provides convenience of processing, manufacture, and assembly, and allows a membrane element that has such a structure to have a small size.
  • first membrane unit 2 and the second membrane unit 3 are wound on a water collecting tube together, which keeps the size of the membrane element small.
  • first membrane unit 2 and the second membrane unit 3 may be wound on a water collecting tube 1 together in one step, which makes it easy to manufacture the membrane element and reduces the number of processing steps.
  • the raw water flow passage of a membrane unit generally leads into the membrane unit from one end and leads out of the membrane unit from the other end.
  • at least one of the raw water flow passage of said first membrane unit 2 and that of said second membrane unit 3 extends spirally in a circumferential direction of said water collecting tube 1. Since said first membrane unit 2 and/or second membrane unit 3 are or is wound on said water collecting tube 1, a membrane unit having such a structure has a long raw water flow passage.
  • the raw water flow passages of said first membrane unit 2 and/or second membrane unit 3 having such a structure cannot be extended infinitely.
  • the raw water flow passage is lengthened, as the raw water flow passage extends spirally in a circumferential direction of the water collecting tube 1, the pure water flow passage of the membrane unit is lengthened accordingly; in this case, the back pressure of the membrane unit is high, which usually leads to a decrease in the pure water yield of the membrane unit.
  • FIGS 1 to 5 show a specific embodiment of a membrane element in the present application.
  • the membrane element in the embodiment comprises a water collecting tube 1, a first membrane unit 2, and a second membrane unit 3. Said first membrane unit 2 and said second membrane unit 3 are wound on said water collecting tube 1 together in one step.
  • said first membrane unit 2 and said second membrane unit 3 are stacked.
  • a raw water flow passage is formed between the front surfaces of adjacent first membrane units 2.
  • a raw water flow passage is also formed between the front surfaces of adjacent second membrane units 3.
  • the rear surface of said first membrane unit 2 and the rear surface of said second membrane unit 3 are pure water flow passages and all lead to said water collecting tube 1.
  • the raw water flow passage of said first membrane unit 2 flows in a direction away from said water collecting tube 1, and the raw water flow passage of said second membrane unit 3 flows in a direction facing said water collecting tube 1.
  • the membrane materials of said first membrane unit 2 and said second membrane unit 3 may be the same or different.
  • the membrane materials between said first membrane units 2 may also be the same or different.
  • the membrane materials between said second membrane units 3 may also be the same or different.
  • the leaf numbers of said first membrane unit 2 and said second membrane unit 3 are at least two.
  • the leaf numbers of said first membrane unit 2 and said second membrane unit 3 may be equal or unequal.
  • the number of said first membrane units 2 is larger than the number of said second membrane units 3.
  • the number of said first membrane units 2 may also be smaller than the number of said second membrane units 3.
  • the front surface of a membrane leaf is sealed (with the front surface on the inner side and the reverse surface on the outside) by folding, gluing, etc. at C, D, and E (at the water collecting tube), and the reverse surface of the membrane leaf is sealed (with the reverse surface on the inner side and the front surface on the outside) by folding, gluing, etc. at A and B, collaborating with the sealing formed by gluing on the membrane leaf rear surfaces AD, AC and BD, BE, thereby separating pure water from raw water.
  • the raw water flow passage of said first membrane unit 2 and that of said second membrane unit 3 extend spirally in a circumferential direction of said water collecting tube 1.
  • the waste water outlet 22 of said first membrane unit is located on a circumferential surface of the front surface of said membrane element, and the raw water inlet 31 of said second membrane unit is located on a circumferential surface of the front surface of said membrane element.
  • the waste water outlet 22 of said first membrane unit is in communication with the raw water inlet 31 of said second membrane unit.
  • said membrane element when said membrane element is expanded, said membrane element is provided with a first side 71 (the left side in the figure) and a second side 72 (the right side in the figure), as well as a third side 73 (the upper side in the figure) and a fourth side 74 (the lower side in the figure), wherein the first side 71 and the second side 72 are disposed facing each other, and the third side 73 and the fourth side 74 are disposed facing each other.
  • Said third side 73 and said fourth side 74 are connected to said first side 71 and said second side 72, respectively.
  • the side of said first membrane unit 2 and that of said second membrane unit 3 that are respectively connected to said water collecting tube 1 are the first side 71 of the membrane element.
  • the pure water outlet of said first membrane unit 2 and the pure water outlet of said second membrane unit 3 are connected to said water collecting tube 1 located on said first side 71.
  • pure water yielded by said first membrane unit 2 and said second membrane unit 3 may be led out of said water collecting tube 1.
  • the waste water outlet 22 of said first membrane unit and the raw water inlet 31 of said second membrane unit, when said membrane element is expanded, are located on the second side 72. When said membrane element is expanded, the raw water flow passage of said first membrane unit 2 and that of said second membrane unit 3 extend in the direction of said membrane element.
  • said membrane element is provided with a first end (the upper end in the figure) and a second end (the lower end in the figure) that face each other in an axial direction of said water collecting tube 1.
  • the raw water inlet 21 of said first membrane unit is located at the first end of said membrane element.
  • the waste water outlet 32 of said second membrane unit is located at the second end of said membrane element.
  • the raw water inlet 21 of said first membrane unit is disposed on the third side 73 of said first membrane unit 2, and the waste water outlet 32 of said second membrane unit is disposed on the fourth side 74 of said second membrane unit 3.
  • the raw water inlet 21 of said first membrane unit may be disposed on the third side 73 that is close to said first side 71.
  • the waste water outlet 32 of said second membrane unit may be disposed on said fourth side 74 that is close to said first side 71.
  • the part of the third side 73 on the side of the raw water flow passage of said first membrane unit 2 except the raw water inlet 21 of said first membrane unit (the section AB) is sealed, and the fourth side 74 on the side of the raw water flow passage of said first membrane unit 2 (the section oD) is sealed.
  • the part of the fourth side 74 on the side of the raw water flow passage of said second membrane unit 3 except the waste water outlet 32 of said second membrane unit (the section EF) is sealed, and the third side 73 on the side of the raw water flow passage of said second membrane unit 3 (the section OH) is sealed.
  • the third side 73 on the side of the raw water flow passage of said first membrane unit 2, except the part corresponding to the raw water inlet 21 of said first membrane unit, and the third side 73 on the side of the raw water flow passage of said second membrane unit 2, except the part corresponding to the raw water inlet 21 of said first membrane unit (the section AB of the third side 73 of said first membrane unit 2 and the section GH of the third side 73 of said second membrane unit 3), are sealed by a first end cover 81, and a part of the third side 73 of said second membrane unit 3 corresponding to the raw water inlet 21 of said first membrane unit (the section OG of the fourth side 74 of said second membrane unit 3) is sealed by gluing on the surface of said second membrane unit 3 that is close to the third side 73 and on the side of the raw water flow passage.
  • the fourth side 74 on the side of the raw water flow passage of said second membrane unit 3, except the part corresponding to the waste water outlet 32 of said second membrane unit, and the fourth side 74 on the side of the raw water flow passage of said first membrane unit 2, except the part corresponding to the waste water outlet 32 of said second membrane unit (the section CD of the fourth side 74 of said first membrane unit 2 and the section EF of the third side 73 of said second membrane unit 3), are sealed by a second end cover 82, and a part of the fourth side 74 of said first membrane unit 2 corresponding to the waste water outlet 32 of said second membrane unit (the section oC of the fourth side 74 of said first membrane unit 2) is sealed by gluing on the surface of said first membrane unit 2 that is close to the fourth side 74 and on the side of the raw water flow passage.
  • sealing by an end cover generally refers to applying glue on an end portion of a membrane unit and then binding the end portion to a wall of the end cover.
  • a membrane element in an embodiment of the present application may comprise a membrane shell 5 through which said water collecting tube 1 passes.
  • Said first membrane unit 2 and said second membrane unit 3 are disposed in said membrane shell 5, and an interlayer 63 is formed between the peripheral surface of said first membrane unit 2 or that of said second membrane unit 3 and an inner wall of said membrane shell 5, allowing the waste water outlet 22 of said first membrane unit to be in communication with the raw water inlet 31 of said second membrane unit.
  • a first opening in communication with the raw water inlet 21 of said first membrane unit is disposed on said first end cover 81.
  • a second opening in communication with the waste water outlet 32 of said second membrane unit is disposed on said second end cover 82.
  • waste water produced by said first membrane unit 2 flows into the raw water inlet 31 of said second membrane unit on the circumferential surface.
  • Pure water filtered and yielded by said first membrane unit 2 and said second membrane unit 3 is led out by said water collecting tube 1.
  • the raw water flow passage of said membrane element may be deemed to be the raw water flow passage of said first membrane unit 2 and the raw water flow passage of said second membrane unit 3 stacked; therefore, the surface flow rate of the membrane element in an embodiment of the present application is high, the anti-contamination performance of the membrane is high, the service life of the membrane is long, and the pure water yield of the membrane element under the same water inlet pressure remains unchanged.
  • the filter cartridge has a relatively simple structure and is easy to install.
  • said first membrane unit 2 and said second membrane unit 3 may be made of the same membrane material.
  • said first membrane unit 2 and said second membrane unit 3 may be reverse osmosis membranes.
  • the amount of water that enters said second membrane unit 3 is smaller than the amount of water that enters said first membrane unit 2; in order to maintain the surface flow rate of said second membrane unit 3, said first membrane unit 2 has a surface area larger than that of said second membrane unit 3 (in other words, said first membrane unit 2 has a membrane leaf number larger than that of said second membrane unit 3).
  • a plurality of first membrane units 2 may be provided, and said plurality of first membrane units 2 are made of the same or different filter membrane materials.
  • a plurality of second membrane units 3 may be provided, and said plurality of second membrane units 3 are made of the same or different filter membrane materials.
  • a plurality of first membrane units 2 and said second membrane units 3 may be provided, and said plurality of first membrane units 2 and said second membrane units 3 are made of the same or different filter membrane materials.
  • said first membrane unit 2 and said second membrane unit 3 may be made of different membranes.
  • said first membrane unit 2 may be a nanofiltration membrane and said second membrane unit 3 may be a reverse osmosis membrane.
  • said first membrane unit 2 in order to ensure a desalination rate of yielded water and prevent formation of scale after water is boiled, said first membrane unit 2 has a surface area smaller than that of said second membrane unit 3 (in other words, said first membrane unit 2 has a membrane leaf number smaller than that of said second membrane unit).
  • Figures 7 to 8 show a specific embodiment of a membrane element in the present application.
  • the waste water outlet 22 of said first membrane unit is located on a circumferential surface of said membrane element
  • the raw water inlet 31 of said second membrane unit is located on a circumferential surface of said membrane element.
  • the raw water flow passage of said first membrane unit 2 and that of said second membrane unit 3 extend spirally in a circumferential direction of said water collecting tube 1.
  • the raw water inlet 21 of said first membrane unit is located at the upper end of said first membrane unit 2.
  • the waste water outlet 32 of said second membrane unit is located at the lower end of said second membrane unit 3.
  • a difference from the previous embodiment is that said first membrane unit 2 and said second membrane unit 3 are spaced and configured in parallel in an axial direction of said water collecting tube 1. Said first membrane unit 2 and said second membrane unit 3 may be wound on said water collecting tube 1 together in one step or two steps.
  • said first membrane unit 2 is provided with a first end (the upper end of said first membrane unit 2 shown in the figure) and a second end (the lower end of said first membrane unit 2 shown in the figure) that face each other in an axial direction of said water collecting tube 1;
  • said second membrane unit 3 is provided with a third end (the upper end of said second membrane unit 3 shown in the figure) and a fourth end (the upper end of said second membrane unit 3 shown in the figure) that face each other in an axial direction of said water collecting tube 1, wherein the second end of said first membrane unit 2 and the third end of said second membrane unit 3 are disposed adjacent to each other.
  • Said membrane element comprises a first end cover 81, a second end cover 82, a third end cover 83, and a fourth end cover 84.
  • Said first end cover 81, second end cover 82, third end cover 83 and fourth end cover 84 are correspondingly disposed at the first end and second end of said first membrane unit 2 and disposed at the third end and fourth end of said second membrane unit 3.
  • the part of the third side 73 on the side of the raw water flow passage of said first membrane unit 2 except the raw water inlet 21 of said first membrane unit is sealed by the first end cover 81.
  • a third opening in communication with the raw water inlet 21 of said first membrane unit is disposed on said first end cover 81.
  • the fourth side 74 on the side of the raw water flow passage of said first membrane unit 2 (the section oD) is sealed by the second end cover 82.
  • the third side 73 on the side of the raw water flow passage of said second membrane unit 3 (the section OH) is sealed by the third end cover 83.
  • the part of the fourth side 74 on the side of the raw water flow passage of said second membrane unit 3 except the waste water outlet 32 of said second membrane unit (the section oF) is sealed by the fourth end cover 84.
  • a fourth opening in communication with the waste water outlet 32 of said second membrane unit is disposed on said fourth end cover 84.
  • Said second end cover 82 and said third end cover 83 seal the fourth side 74 of said first membrane unit 2 and the third side 73 of said second membrane unit 3, respectively, thereby separating the raw water flow passage of said first membrane unit 2 from that of said second membrane unit 3.
  • waste water produced by said first membrane unit 2 flows into the raw water inlet 31 of said second membrane unit on the circumferential surface.
  • the raw water flow passage of said membrane element may be deemed to be the raw water flow passage of said first membrane unit 2 and the raw water flow passage of said second membrane unit 3 stacked; therefore, the surface flow rate of the membrane element in an embodiment of the present application is high, the anti-contamination performance of the membrane is high, the service life of the membrane is long, and the pure water yield of the membrane element under the same water inlet pressure remains unchanged.
  • said first membrane unit 2 and said second membrane unit 3 are wound on a water collecting tube 1 together in one step or two steps; therefore, the method for manufacturing the membrane element in the present embodiment is relatively simple. Compared with the previous embodiment, the membrane element has a relatively small sectional area but a relatively long raw water flow passage.
  • a membrane element in an embodiment of the present application may comprise a membrane shell 5 through which said water collecting tube 1 passes.
  • Said first membrane unit 2 and said second membrane unit 3 are disposed in said membrane shell 5, and an interlayer 63 is formed between the peripheral surface of said first membrane unit 2 and that of said second membrane unit 3 and an inner wall of said membrane shell 5, allowing the waste water outlet 22 of said first membrane unit to be in communication with the raw water inlet 31 of said second membrane unit.
  • said first membrane unit 2 and said second membrane unit 3 may be made of different membranes.
  • said first membrane unit 2 may be a nanofiltration membrane and said second membrane unit 3 may be a reverse osmosis membrane.
  • said first membrane unit 2 in order to ensure a desalination rate of yielded water and prevent formation of scale after water is boiled, said first membrane unit 2 has a surface area smaller than that of said second membrane unit 3.
  • the length of said first membrane unit 2 in an axial direction of said water collecting tube 1 is smaller than the length of said second membrane unit 3 in an axial direction of said water collecting tube 1 (as shown in the figure).
  • the area of a cross-section of said first membrane unit 2 that is perpendicular to an axial direction of said water collecting tube 1 is smaller than the area of a cross-section of said second membrane unit 3 that is perpendicular to an axial direction of said water collecting tube 1.
  • the raw water flow passage of said first membrane unit 2 or that of said second membrane unit 3 may also extend spirally in a circumferential direction of said water collecting tube 1.
  • FIGs 10 to 14 show another specific embodiment of a membrane element in the present application.
  • the membrane element in the embodiment comprises a water collecting tube 1, a first membrane unit 2, and a second membrane unit 3. Said first membrane unit 2 and said second membrane unit 3 are wound on said water collecting tube 1 together in one step.
  • said first membrane unit 2 and said second membrane unit 3 are stacked.
  • a raw water flow passage is formed between the front surfaces of adjacent first membrane units 2.
  • a raw water flow passage is also formed between the front surfaces of adjacent second membrane units 3.
  • the rear surface of said first membrane unit 2 and the rear surface of said second membrane unit 3 are pure water flow passages and all lead to said water collecting tube 1.
  • the raw water flow passage of said first membrane unit 2 flows in a direction away from said water collecting tube 1, and the raw water flow passage of said second membrane unit 3 flows in a direction facing said water collecting tube 1.
  • the membrane materials of said first membrane unit 2 and said second membrane unit 3 may be the same or different.
  • the membrane materials between said first membrane units 2 may also be the same or different.
  • the membrane materials between said second membrane units 3 may also be the same or different.
  • the leaf numbers of said first membrane unit 2 and said second membrane unit 3 are at least two.
  • the leaf numbers of said first membrane unit 2 and said second membrane unit 3 may be equal or unequal.
  • the number of said first membrane units 2 is larger than the number of said second membrane units 3.
  • the number of said first membrane units 2 may also be smaller than the number of said second membrane units 3.
  • the front surface of a membrane leaf is sealed (with the front surface on the inner side and the reverse surface on the outside) by folding, gluing, etc. at C, D, and E (at the water collecting tube), and the reverse surface of the membrane leaf is sealed (with the reverse surface on the inner side and the front surface on the outside) by folding, gluing, etc. at A and B, collaborating with the sealing formed by gluing on the membrane leaf rear surfaces AD, AC and BD, BE, thereby separating pure water from raw water.
  • the raw water flow passage of said first membrane unit 2 and that of said second membrane unit 3 extend spirally in a circumferential direction of said water collecting tube 1.
  • said membrane element is provided with a first end (the upper end in the figure) and a second end (the lower end in the figure) that face each other in an axial direction of said water collecting tube 1.
  • the raw water inlet 21 of said first membrane unit is located at the first end of said membrane element.
  • the waste water outlet 22 of said first membrane unit is located at the second end of said membrane element.
  • the raw water inlet 31 of said second membrane unit is located at the second end of said membrane element.
  • the waste water outlet 22 of said first membrane unit is in communication with the raw water inlet 31 of said second membrane unit.
  • the waste water outlet 32 of said second membrane unit is located at the first end of said membrane element.
  • Said membrane element further comprises a first end cover 81 disposed at the first end of said membrane element and a second end cover 82 disposed at the second end of said membrane element.
  • Said first end cover 81 is provided with a first through hole 61 that is in communication with the raw water inlet 21 of said first membrane unit and a second through hole 62 that is in communication with the waste water outlet 32 of said second membrane unit
  • said second end cover 82 is provided with a third through hole 981 that is in communication with the waste water outlet 22 of said first membrane unit and a fourth through hole 982 that is in communication with the raw water inlet 31 of said second membrane unit.
  • the third through hole 981 and the fourth through hole 982 may, by a membrane shell, form flow passages that are in communication with each other.
  • said membrane element when expanded, is provided with a first side 71 (the left side in the figure), which is connected to said water collecting tube 1, and a second side 72 (the right side in the figure) facing said first side 71.
  • Said membrane element when expanded, is further provided with a third side 73 (the upper side in the figure) and a fourth side 74 (the lower side in the figure) that face each other, said third side 73 and said fourth side 74 being connected to said first side 71 and said second side 72, respectively.
  • the waste water outlet 22 of said first membrane unit is disposed on said fourth side 74 that is close to said second side 72.
  • the raw water inlet 31 of said second membrane unit is disposed on the fourth side 74 that is close to said first side 71.
  • the raw water inlet 21 of said first membrane unit is disposed on the third side 73 that is close to said first side 71.
  • the waste water outlet of said second membrane unit 3 is disposed on said third side 73 that is close to said second side 72.
  • the part of the third side 73 on the side of the raw water flow passage of said first membrane unit 2 except the raw water inlet 21 of said first membrane unit (the section AB) is sealed; the part of the fourth side 74 on the side of the raw water flow passage of said first membrane unit 2 except the waste water outlet 22 of said first membrane (the oL section) unit is sealed; the part of the fourth side 74 on the side of the raw water flow passage of said second membrane unit 3 except the raw water inlet 31 of said second membrane (the OQ section) unit is sealed; the part of the third side 73 on the side of the raw water flow passage of said second membrane unit 3 except the waste water outlet 32 of said second membrane (the EF section) unit is sealed; the second side 72 of said membrane element is sealed.
  • a part of the third side 73 of said first membrane unit 2 corresponding to the waste water outlet 32 of said second membrane unit is sealed by gluing on the surface of said first membrane unit 2 that is close to the third side 73 and on the side of the raw water flow passage.
  • a part of the third side 73 of said second membrane unit 3 corresponding to the raw water inlet 21 of said first membrane unit is sealed by gluing on the surface of said second membrane unit 3 that is close to the third side and on the side of the raw water flow passage.
  • a part of the fourth side 74 of said first membrane unit 2 corresponding to the raw water inlet 31 of said second membrane unit is sealed by gluing on the surface of said first membrane unit 2 that is close to the fourth side 74 and on the side of the raw water flow passage.
  • a part of the fourth side 74 of said second membrane unit 3 corresponding to the waste water outlet 22 of said first membrane unit namely, the section PF of the fourth side 74 of said second membrane unit 3 is sealed by gluing on the surface of said second membrane unit 3 that is close to the fourth side and on the side of the raw water flow passage.
  • the second side 72 on the side of the raw water flow passage of said membrane element is sealed by an adhesive tape so that no waste water flows out from a circumferential surface of said membrane element.
  • said first membrane unit 2 and said second membrane unit 3 may be made of the same membrane material.
  • said first membrane unit 2 and said second membrane unit 3 may be reverse osmosis membranes.
  • first membrane unit 2 and said second membrane unit 3 may be selected as needed, and will not be described again herein.
  • FIGs 15 to 22 show another specific embodiment of a membrane element in the present application.
  • the present application discloses a membrane element, comprising a water collecting tube 1, a first membrane unit 2, and a second membrane unit 3.
  • the raw water flow passage of said first membrane unit 2 and that of said second membrane unit 3 extend spirally in a circumferential direction of said water collecting tube 1.
  • Said water collecting tube 1 comprises a first central tube 11 and a second central tube 12 that is sleeved upon said first central tube 11.
  • Said first membrane unit 2 is wound on said first central tube 11, and a first pure water guide passage 111 that is in communication with the pure water outlet of said first membrane unit 2 is disposed on the inner side of said first central tube 11, for collecting pure water filtered and yielded by said first membrane unit 2.
  • Said second membrane unit 3 is wound on said second central tube 12, a second pure water guide passage 112 that is in communication with the pure water outlet of said second membrane unit 3 is disposed on said second central tube 12, and said second pure water guide passage 112 is separated from the inner side of said second central tube 12.
  • the first side 71 (the left side in the figure) of said first membrane unit 2 is connected to said first central tube 11; in other words, the pure water outlet of said first membrane unit 2 is located on the first side 71; in other words, the rear interlayer of said first membrane unit 2 is in communication with said first central tube 11, allowing pure water subjected to osmotic filtration in the raw water flow passage to be collected in said first central tube 11.
  • the raw water inlet 21 of said first membrane unit is located on the second side 72 that faces said first side 71 (namely, located on a circumferential surface after being wound).
  • the waste water outlet 22 of said first membrane unit is located on the third side 73 and the fourth side 74. Said third side 73 and said fourth side 74 are connected to said first side 71 and said second side 72, respectively.
  • waste water filtered out by said first membrane unit 2 flows out from both end portions of said first membrane unit 2.
  • the waste water outlet 22 of said first membrane unit is close to the first side 71 of said second membrane unit 3 and far away from its second side 72.
  • the first side 71 (the left side in the figure) of said second membrane unit 3 is connected to said second central tube 12; in other words, the pure water outlet of said second membrane unit 3 is located on the first side 71; in other words, the pure water outlet of said second membrane unit 3 is in communication with said second central tube 12, allowing pure water subjected to osmotic filtration in the raw water flow passage to be collected in said second central tube 12.
  • the waste water outlet 32 of said second membrane unit is located on the second side 72 of said second membrane unit 3 that faces said first side 71 (namely, located on a circumferential surface after being wound).
  • the raw water inlet 31 of said second membrane unit is located on the third side 73 and the fourth side 74 of said second membrane unit 3. Said third side 73 and said fourth side 74 are connected to said first side 71 and said second side 72, respectively. In other words, the raw water inlet 21 of said first membrane unit is located at both ends thereof. In order to lengthen the raw water flow passage as much as possible, in the present embodiment, the raw water inlet 31 of said second membrane unit is close to its first side 71 and far away from its second side 72.
  • a first gap space 65 is formed between an outer wall of said first membrane unit 2 and an inner wall of said second central tube 12, allowing raw water to flow from the raw water inlet 21 of said first membrane unit into said first membrane unit 2 through said first gap space 65.
  • Said membrane element may further comprise a membrane shell 5 (not shown), and a second gap space 66 is formed between an inner wall of said membrane shell 5 and an outer wall of said second membrane unit 3, allowing waste water filtered out by said second membrane unit 3 to be guided to the outside from said second gap space 66.
  • said second central tube 12 may be roughly cylindrical.
  • a penetrating hole for disposing said first membrane unit 2 and said first central tube 11 may be provided on an inner side of said second central tube 12.
  • a plurality of openings configured at intervals in a circumferential direction (namely, a first passage 113) may be disposed on an outer side wall of said second central tube 12.
  • a second passage 114 that extends roughly in an axial direction of said second central tube 12 may be formed on a wall of said second central tube 12. Said second passage 114 is in communication with said first passage 113 to form a second pure water guide passage 112.
  • said second pure water guide passage 112 is separated from the penetrating hole so that pure water yielded by said second membrane unit 3 is separated from said first membrane unit 2.
  • Said second passage 114 opens into one or both of the two ends that face each other in an axial direction of said second central tube 12, for guiding pure water out from said second central tube 12.
  • a plurality of first passages 113 are provided, and said plurality of first passages 113 are configured at intervals in a circumferential direction of said second central tube 12, and said second passage 114 extends in an axial direction of said second central tube 12.
  • the second central tube 1221 may also have another structure; for example, Figures 19 and 20 show another optional embodiment of the second central tube 12.
  • Said membrane element is provided with a first end and a second end that face each other in an axial direction of said water collecting tube 1.
  • Said membrane element may comprise an end cover that is disposed at the same end of said first membrane unit 2 and said second membrane unit 3, and said end cover is provided with a passage that allows the waste water outlet of said first filter membrane (namely, the first gap space 65) to be in communication with the waste water outlet of said second filter membrane (namely, the second gap space 66).
  • the waste water outlet 22 of said first membrane unit is located at both ends of said membrane element, and the raw water inlet 31 of said second membrane unit is located at both ends of said membrane element.
  • said membrane element comprises a second end cover 82 located at the lower end.
  • Said second end cover 82 comprises: a first cover body 91 sleeved upon said first membrane unit 2 and a second cover body 92 sleeved upon said second membrane unit 3, said first cover body 91 being provided with a first space 96 that is in communication with the waste water outlet of said first filter membrane, said second cover body 92 being provided with a second space 97 that is in communication with the raw water inlet of said second filter membrane.
  • a fifth through hole 98 for allowing communication between said first space 96 and said second space 97 is disposed on a side wall of the second central tube 12.
  • Said first cover body 91 matches an inner wall of said second central tube 12 to seal said first gap space 65.
  • said membrane element comprises a first end cover 81 located at the upper end.
  • Said first end cover 81 is provided with a first pure water outlet that is in communication with the first pure water guide passage 111 of said first central tube 11, a second pure water outlet that is in communication with the first pure water guide passage 111 of said second central tube 12, and a waste water passage that is in communication with the waste water outlet of said second filter membrane.
  • said first end cover 81 is provided with a pure water mixing passage (not shown) for allowing communication between said first pure water guide passage 111 and said second pure water guide passage.
  • said first end cover 81 comprises a third cover body 93 sleeved upon said first membrane unit 2, a fourth cover body 94 sleeved upon said second membrane unit 3, and a fifth cover body 95 sleeved upon the end portion of said second central tube 12 and that of said first central tube 11.
  • Said third cover body 93 is provided with a first opening that is in communication with the waste water outlet 22 of said first membrane unit and a second opening that is in communication with the raw water inlet 21 of said first membrane unit, said first opening being separated from said second opening.
  • An outer wall of said third cover body 93 matches an inner wall of said second central tube 12 to seal said first gap space 65.
  • a third opening in communication with the waste water outlet 32 of said second membrane unit is disposed on said fourth cover body 94; said fifth cover body 95 is provided with a first pure water outlet that is in communication with said first central tube 11, a second pure water outlet that is in communication with said second central tube 12, a waste water passage that is in communication with the first opening of said third cover body 93, and a fourth passage 99 for allowing communication between the second opening of said third cover body 93 and the third opening of said fourth cover body 94.
  • said fourth passage 99 comprises a first flow passage that extends in an axial direction of said membrane element and is in communication with an end portion of said first membrane unit 2, a second flow passage that extends in an axial direction of said membrane element and is in communication with an end portion of said second membrane unit 3, and a third flow passage that is in communication with said first flow passage and said second flow passage and extends in a radial direction of said membrane element.
  • raw water let in from a circumferential surface of said first membrane unit 2 may enter the raw water flow passage of said second membrane unit 3 after being filtered by said first membrane unit 2; in other words, the raw water is filtered again by said second membrane unit 3, and pure water is yielded after filtration again by said second membrane unit 3.
  • the raw water flow passage of said membrane element may be deemed to be the raw water flow passage of said first membrane unit 2 and the raw water flow passage of said second membrane unit 3 stacked; therefore, the surface flow rate of the membrane element in an embodiment of the present application is high, the anti-contamination performance of the membrane is high, the service life of the membrane is long, and the pure water yield of the membrane element under the same water inlet pressure remains unchanged.
  • said first central tube 11 and said second central tube 12 are sleeved upon each other, and said second pure water guide passage 112 is disposed on said second central tube 12; thus, said membrane element has a simple structure and a small size, and is easy to install.
  • the first membrane unit 2 and second membrane unit 3 in the present embodiment have relatively long raw water flow passages; therefore, the membrane element has a high surface flow rate, a high filtration efficiency, and high anti-contamination performance.
  • the waste water outlet 32 of said second membrane unit is located on one of the third side 73 and the fourth side 74; in other words, the waste water outlet 32 of said second membrane unit is located at one end thereof.
  • the raw water inlet 21 of said first membrane unit is also located on one of the third side 73 and the fourth side 74; in other words, the raw water inlet 21 of said first membrane unit is located at the end corresponding to the waste water outlet 32 of said second membrane unit.
  • both the waste water outlet 32 of said second membrane unit and the raw water inlet 21 of said first membrane unit are located at the upper end.
  • said first membrane unit 2 is a nanofiltration membrane and said second membrane unit 3 is a reverse osmosis membrane.
  • a ratio of a surface area of said first membrane unit 2 to a surface area of said second membrane unit 3 is in a range of 1:1 to 1:2.
  • Figures 23 to 25 show another optional embodiment of the present application. As shown in Figures 23 , 24 , and 25 , a difference between another optional embodiment and the previous embodiment is that said first membrane unit 2 is wound on said second central tube 12 and that said second membrane unit 3 is wound on said first central tube 11.
  • a first gap space 65 is formed between an outer wall of said second membrane unit 3 and an inner wall of said second central tube 12, allowing waste water filtered out by said first membrane unit 2 to flow from the raw water inlet 31 of said second membrane unit into said second membrane unit 3 through said first gap space 65.
  • Said membrane element may further comprise a membrane shell 5, and a second gap space 66 is formed between an inner wall of said membrane shell 5 and an outer wall of said first membrane unit 2, allowing raw water to flow from the raw water inlet 21 of said first membrane unit into said first membrane unit 2 through said second gap space 66.
  • the waste water outlet 22 of said first membrane unit is located at an end of said membrane element.
  • the raw water inlet 31 of said second membrane unit may also be located at an end of said membrane element that corresponds to the waste water outlet 22 of said first membrane unit.
  • the waste water outlet 22 of said first membrane unit and the raw water inlet 31 of said second membrane unit are located at the first end of said membrane element.
  • the waste water outlet 22 of said first membrane unit is located on the third side 73 thereof.
  • the raw water inlet 31 of said second membrane unit is also located on the third side thereof.
  • both said first membrane unit 2 and said second membrane unit 3 are reverse osmosis membranes.
  • a ratio of a surface area of said first membrane unit 2 to a surface area of said second membrane unit 3 is in a range of 2:1 to 1:1.
  • an embodiment of the present application further discloses a membrane element that further comprises a first water tube 101 and a second water tube 102.
  • the first side 71 on the side of the pure water flow passage of the first membrane unit 2 and the first side 71 on the side of the pure water flow passage of the second membrane unit 3 are disposed on the water collecting tube 1.
  • the first water tube 101 is disposed on the first side 71 on the side of the raw water flow passage of the first membrane unit 2, so that the front surface of the first membrane unit 2 is wrapped around the first water tube 101.
  • the first water tube 101 comprises a plurality of first guide holes disposed on a side wall of said first water tube 101, a first guide passage that extends in an axial direction and is in communication with said plurality of first guide holes, and a first opening that is disposed in an end portion of said first water tube 101 and is in communication with said first guide passage.
  • Raw water may enter the first guide passage through the first opening and be guided into said first membrane unit 2 through the first guide holes. Through the first guide holes, the raw water may extend spirally in a circumferential direction and flow to the outside from the second side 72 (the outer edge formed after winding) of said first membrane unit 2.
  • the second water tube 102 is disposed on the first side 71 on the side of the raw water flow passage of the second membrane unit 3, so that the front surface of the second membrane unit 3 is wrapped around the second water tube 102.
  • Said second water tube 102 comprises a plurality of second guide holes disposed on a side wall of said second water tube 102, a second guide passage that extends in an axial direction and is in communication with said plurality of second guide holes, and a second opening that is disposed in an end portion of said second water tube 102 and is in communication with said second guide passage.
  • Waste water outputted from the second side 72 of said first membrane unit 2 enters the second side 72 (the outer edge formed after winding) of said second membrane unit 3, flows extending spirally in a circumferential direction, enters the second guide holes of the second water tube 102, flows into the second guide passage through the second guide holes, and finally flows out of the second opening.
  • the first opening and the second opening may be located on either side of the water collecting tube 1.
  • said membrane element when expanded, is provided with a third side 73 and a fourth side 74 that face each other, said third side 73 and said fourth side 74 being connected to said first side 71 and said second side 72, respectively.
  • Said membrane element comprises an end cover that is disposed at both ends of said first membrane unit 2 and said second membrane unit 3; said end cover is penetrated by said water collecting tube 1, said first water tube 101, and said second water tube 102; said end cover seals the third side 73 and fourth side 74 of said first membrane unit 2 and said second membrane unit 3.
  • said membrane element further comprises a membrane shell and a sealing element.
  • Said sealing element is disposed between an outer side wall of said end cover and an inner side wall of the membrane shell. The space between two sealing elements and the membrane shell allows communication between the waste water outlet of said first membrane unit 2 and the raw water inlet of said second membrane unit 3.
  • said sealing element may be sleeved upon said first water tube 101 and said second water tube 102, thereby separating the waste water in said first water tube 101 and said second water tube 102 from the space in the membrane shell.
  • said sealing element may be wrapped around said first membrane unit 2 and said second membrane unit 3, so that said sealing element forms a sealed space with said first membrane unit 2 and said second membrane unit 3 and maintains separation from the space in the membrane shell.
  • an embodiment of the present application further discloses a membrane element that comprises a water collecting tube 1, a first membrane unit 2 disposed on the water collecting tube 1, and a second membrane unit 3 disposed on the water collecting tube 1.
  • Said first membrane unit 2 (blue membrane) and said second membrane unit 3 (side-flow membrane) are arranged at intervals in an axial direction of the water collecting tube 1.
  • the raw water inlet of said first membrane unit 2 is located on the third side 73 thereof and the waste water outlet is located the fourth side 74 thereof.
  • the raw water flow passage of said first membrane unit 2 extends in an axial direction of said water collecting tube 1.
  • the raw water inlet of said second membrane unit 3 is located on the second side 72 thereof and the waste water outlet is located the fourth side 74 thereof.
  • the raw water flow passage of said second membrane unit 3 extends spirally in a circumferential direction.
  • an embodiment of the present application further discloses a membrane element that comprises a water collecting tube 1, a first membrane unit 2 disposed on the water collecting tube 1, and a second membrane unit 3 disposed on the water collecting tube 1.
  • Said first membrane unit 2 (side-flow membrane) and said second membrane unit 3 (side-flow membrane) are arranged at intervals in an axial direction of the water collecting tube 1.
  • the raw water inlet of said first membrane unit 2 is located on the second side 72 thereof and the waste water outlet is located the fourth side 74 thereof.
  • the raw water inlet of said second membrane unit 3 is located on the third side 73 thereof and the waste water outlet is located the second side 72 thereof.
  • the raw water flow passage of said first membrane unit 2 and that of said second membrane unit 3 extend spirally in a circumferential direction.
  • a sealing element for example, a rubber ring
  • an embodiment of the present application further discloses a membrane element that comprises a water collecting tube 1, a first membrane unit 2 disposed on the water collecting tube 1, and a second membrane unit 3 disposed on the water collecting tube 1.
  • Said first membrane unit 2 (side-flow membrane) and said second membrane unit 3 (side-flow membrane) are arranged at intervals in an axial direction of the water collecting tube 1.
  • the raw water inlet of said first membrane unit 2 is located on the second side 72 thereof and the waste water outlet is located the fourth side 74 thereof.
  • the raw water inlet of said second membrane unit 3 is located on the second side 72 thereof and the waste water outlet is located the fourth side 74 thereof.
  • the raw water flow passage of said first membrane unit 2 and that of said second membrane unit 3 extend spirally in a circumferential direction.
  • a sealing element for example, a rubber ring
  • Embodiments of the present application further disclose a filter cartridge that comprises the above-described membrane element.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Nanotechnology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
EP18848985.0A 2017-08-21 2018-08-21 Élément de membrane et cartouche filtrante Pending EP3673980A4 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
CN201721047437.6U CN207418343U (zh) 2017-08-21 2017-08-21 膜元件和滤芯
CN201710719677.4A CN109422329B (zh) 2017-08-21 2017-08-21 膜元件和滤芯
CN201721047971 2017-08-21
CN201721647839.XU CN207667450U (zh) 2017-08-21 2017-12-01 膜元件和滤芯
PCT/CN2018/101508 WO2019037713A1 (fr) 2017-08-21 2018-08-21 Élément de membrane et cartouche filtrante

Publications (2)

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EP3673980A1 true EP3673980A1 (fr) 2020-07-01
EP3673980A4 EP3673980A4 (fr) 2021-05-19

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WO2019037713A1 (fr) 2019-02-28
EP3673980A4 (fr) 2021-05-19

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